Question 1

What is a space station?

Accepted Answer

A space station is a spacecraft designed to stay in orbit for years so that people can live, work and do research there. Crews and cargo arrive and leave on other vehicles, while the station remains in space.

Question 2

How is a station different from a spacecraft?

Accepted Answer

A station is a spacecraft. What distinguishes it is purpose: long-duration habitation, research and operations, rather than transport. A crew vehicle carries people for days; a station hosts them for months.

Question 3

Why doesn't a station fall to Earth?

Accepted Answer

It is falling — continuously. It moves sideways at about 7.7 km/s in low Earth orbit, so as it falls the curved Earth drops away beneath it. Thin air still causes drag, so stations are periodically reboosted.

Question 4

What is microgravity?

Accepted Answer

Gravity at station altitude is still about 90% of surface gravity. Astronauts float because they and the station are in free fall together. Tiny residual accelerations from drag, vibration and crew movement remain, hence 'micro' gravity.

Question 5

How do astronauts breathe?

Accepted Answer

Life support keeps cabin pressure and oxygen close to sea-level conditions. Oxygen is produced by splitting water with electricity, CO₂ is removed by regenerable sorbents, and filters remove trace contaminants.

Question 6

Where does water come from?

Accepted Answer

Initially from Earth, but most water is recycled. The ISS recovers water from humidity condensate and urine; NASA reports that the ISS life-support system has demonstrated recovery of about 98% of water. Make-up water still arrives on cargo vehicles.

Question 7

How does a toilet work in microgravity?

Accepted Answer

Airflow replaces gravity: fans draw waste away from the body into containers. Urine is collected separately so its water can be recovered, while solid waste is stored and removed on departing cargo vehicles.

Question 8

How does a station generate electricity?

Accepted Answer

Solar arrays generate power in sunlight and charge batteries that carry the station through Earth's shadow — roughly a third of every orbit in LEO. NASA lists the ISS's eight arrays as providing 75–90 kW.

Question 9

Why are radiators required?

Accepted Answer

Almost all electrical power ends up as heat. In vacuum there is no air to carry heat away, so it must be radiated as infrared from large panels. Radiators also absorb sunlight and Earth's infrared, so they must be big.

Question 10

How does docking work?

Accepted Answer

The visiting vehicle matches orbits through phasing burns, then uses relative navigation to approach along a corridor with hold points. Soft capture absorbs motion, hard capture forms a pressure-tight seal, and a leak check precedes hatch opening.

Question 11

How is orbit maintained?

Accepted Answer

Drag slowly lowers the orbit. Thrusters on the station or on docked vehicles periodically raise it (reboost), and are also used to avoid tracked debris.

Question 12

What happens during a power failure?

Accepted Answer

Power is split into independent channels. A fault is isolated by switches, critical loads are fed from healthy channels, and lower-priority loads — often experiments — are shed until repairs are made.

Question 13

How are fires handled?

Accepted Answer

Smoke detectors raise alarms; ventilation and power to the area are removed, because flames in microgravity depend on forced airflow; crew use extinguishers and breathing equipment, then clean the atmosphere.

Question 14

What is BAS?

Accepted Answer

Bharatiya Antariksh Station is India's planned indigenous five-module space station in low Earth orbit. The Cabinet approved the first module, BAS-01, in September 2024, targeted by 2028, with all five modules operational by 2035.

Question 15

Why is India building BAS?

Accepted Answer

Government statements describe BAS as a platform for medium- to long-duration human missions and microgravity research, building capabilities for sustained human spaceflight and supporting the national vision of an Indian crewed lunar mission by 2040.

Question 16

How will BAS support Indian research?

Accepted Answer

Targeted microgravity research areas include life sciences, pharmaceuticals, materials science and manufacturing technologies, with racks for microgravity experiments. ISRO's IMEx programme gives researchers a pathway from lab feasibility to possible flight opportunities, including BAS.

Question 17

What is Gateway?

Accepted Answer

Gateway was designed as a NASA-led international station in a near-rectilinear halo orbit around the Moon. On 24 March 2026, NASA stated it intends to pause Gateway in its current form and shift focus to lunar-surface infrastructure.

Question 18

Why put a station around the Moon?

Accepted Answer

A lunar-orbit station can serve as a staging point, communications node and testbed for deep-space habitation. The trade-off is added complexity versus going directly to the surface — a question agencies continue to revisit.

Question 19

What happens after ISS?

Accepted Answer

NASA plans to end ISS operations in 2030 and deorbit it in a controlled manner. Commercial stations are in development, and NASA intends to buy services as one of many customers.

Question 20

Can we manufacture products in space?

Accepted Answer

Demonstrations of crystals, fibres and bioprinting have flown, but routine commercial production has not yet been shown. Repeatable quality and economics are the open questions.

Question 21

Can artificial gravity be created?

Accepted Answer

Rotation can produce a centripetal acceleration that feels like gravity. Small centrifuges are used for experiments, but no crewed rotating station has been built; rotation rate, radius and cost are the challenges.

Question 22

Can stations become hotels?

Accepted Answer

Private astronaut missions have visited the ISS, and some commercial station developers include tourism in their plans. Whether tourism can sustain a station financially is not yet demonstrated.

Question 23

Can we build stations around Mars?

Accepted Answer

In principle yes, but only as a future concept. Delays of many minutes, rare resupply and radiation would require a highly autonomous, self-sufficient design.

Question 24

Could a station be assembled autonomously?

Accepted Answer

Automated rendezvous and docking already assemble modules today. Fully autonomous robotic assembly of large structures is an active research area.

Question 25

How would a postdoctoral researcher conduct an experiment in orbit?

Accepted Answer

Define a question that truly needs microgravity, show feasibility in the lab, validate on ground or reduced-gravity platforms, then respond to an agency or national-lab opportunity. Expect safety reviews, flight qualification and a long lead time.

Space Station Research & Engineering Simulator

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